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92 lines
2.7 KiB
92 lines
2.7 KiB
package trace
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import (
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"io"
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)
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var (
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// global tracer
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_tracer Tracer = nooptracer{}
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)
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// SetGlobalTracer SetGlobalTracer
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func SetGlobalTracer(tracer Tracer) {
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_tracer = tracer
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}
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// Tracer is a simple, thin interface for Trace creation and propagation.
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type Tracer interface {
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// New trace instance with given title.
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New(operationName string, opts ...Option) Trace
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// Inject takes the Trace instance and injects it for
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// propagation within `carrier`. The actual type of `carrier` depends on
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// the value of `format`.
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Inject(t Trace, format interface{}, carrier interface{}) error
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// Extract returns a Trace instance given `format` and `carrier`.
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// return `ErrTraceNotFound` if trace not found.
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Extract(format interface{}, carrier interface{}) (Trace, error)
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}
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// New trace instance with given operationName.
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func New(operationName string, opts ...Option) Trace {
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return _tracer.New(operationName, opts...)
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}
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// Inject takes the Trace instance and injects it for
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// propagation within `carrier`. The actual type of `carrier` depends on
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// the value of `format`.
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func Inject(t Trace, format interface{}, carrier interface{}) error {
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return _tracer.Inject(t, format, carrier)
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}
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// Extract returns a Trace instance given `format` and `carrier`.
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// return `ErrTraceNotFound` if trace not found.
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func Extract(format interface{}, carrier interface{}) (Trace, error) {
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return _tracer.Extract(format, carrier)
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}
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// Close trace flush data.
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func Close() error {
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if closer, ok := _tracer.(io.Closer); ok {
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return closer.Close()
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}
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return nil
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}
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// Trace trace common interface.
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type Trace interface {
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// Fork fork a trace with client trace.
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Fork(serviceName, operationName string) Trace
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// Follow
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Follow(serviceName, operationName string) Trace
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// Finish when trace finish call it.
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Finish(err *error)
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// Scan scan trace into info.
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// Deprecated: method Scan is deprecated, use Inject instead of Scan
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// Scan(ti *Info)
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// Adds a tag to the trace.
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//
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// If there is a pre-existing tag set for `key`, it is overwritten.
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//
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// Tag values can be numeric types, strings, or bools. The behavior of
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// other tag value types is undefined at the OpenTracing level. If a
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// tracing system does not know how to handle a particular value type, it
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// may ignore the tag, but shall not panic.
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// NOTE current only support legacy tag: TagAnnotation TagAddress TagComment
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// other will be ignore
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SetTag(tags ...Tag) Trace
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// LogFields is an efficient and type-checked way to record key:value
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// NOTE current unsupport
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SetLog(logs ...LogField) Trace
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// Visit visits the k-v pair in trace, calling fn for each.
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Visit(fn func(k, v string))
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// SetTitle reset trace title
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SetTitle(title string)
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}
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